I will be arriving into GRU on UA and connecting on Azul to POA, next week. Will only be in Brazil a total of ~36 hours (arrive Weds AM, depart Thurs PM) as the trip is to escort a disabled family member back to the US (long story). I'm hoping/assuming that such a short stay would not cause any immigration questions, not sure if anyone has experience or can advise?

It looks like we'll arrive Terminal 3 and depart Terminal 1. Any tips or tricks welcome (I didn't see a GRU airport sticky).

Thank you!